| 摘要 |
PROBLEM TO BE SOLVED: To provide a dual band tuning circuit that can be quickly in operation even at a low voltage. SOLUTION: The circuit 1 has a 1st impedance element 4 and a 2nd impedance element 5 between a high frequency input port 2 and a high frequency output port 3. The impedance elements 4, 5 are used to tune a 1st high frequency signal. A switching transistor(TR) 9 connected to the 2nd impedance element 5 short-circuits the 2nd impedance element 5 and the 1st impedance element 4 itself tunes a 2nd high frequency signal.
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